DK2652242T3

DK2652242T3 - Plugging device

Info

Publication number: DK2652242T3
Application number: DK11785026.3T
Authority: DK
Inventors: Espen Hiorth; Steinar Georgsen; Christian Malvik
Original assignee: Interwell Technology As
Priority date: 2010-12-15
Filing date: 2011-11-21
Publication date: 2015-02-23
Also published as: WO2012079914A3; NO332116B1; EP2652242B1; WO2012079913A3; NO338096B1; EP2652243B1; MX2013006684A; BR112013014902A2; WO2012079913A2; BR112013014902B1; US9291028B2; EP2652242A2; EP2652243A2; WO2012079914A2; DK2652243T3; NO20130830A1; MX2013006685A; US20130333875A1; MX354362B; US20130319654A1

Description

FIELD OF THE INVENTION

[0001] The present invention relates to a plugging device.

BACKGROUND OF THE INVENTION

[0002] Several types of plugging devices for plugging of hydrocarbon well pipes are known. In US 7,178,602 it is shown a plugging device having an anchoring device with gripping elements for anchoring the plugging device to the inner casing of the well pipe to prevent movement of the plugging device. The plugging device also comprises an expandable packer element for sealing the well pipe. The packer element is supported by a link connection for compressing and thereby expanding the packer element radially.

[0003] Another plugging device is known from US 7,290,603. Here an expandable packer element is compressed axially by means of two pressure rings, thereby providing a radial expansion of the packer element. Moreover, radially expandable ring elements are provided in order to improve the support the packer element in the expanded position.

[0004] US 2004/003928 describes a composite bridge plug system for containing a well bore with reduced drill up time. The composite bridge plug system includes an elongate mandrel, a head member attached to a lower portion of the mandrel, an upper collar positioned about an upper portion of the mandrel, and a plurality of gripping members positioned about the mandrel. US 2004/069502 describes an apparatus for sealing a tubular. In one aspect, the apparatus is a sealing apparatus for a downhole tool such as a bridge plug, packer, or frac-plug. In one embodiment, the present invention provides for a sealing apparatus having a body and a sealing system disposed about the body. The sealing apparatus further includes one or more extrusion rings disposed at each end of the sealing system. The sealing apparatus may also have a first cone to support the one or more extrusion rings and a second cone expandable over the first cone.

[0005] A so-called high expansion plugging device has a relatively narrow diameter in retracted state, allowing the plugging device to pass restrictions in the well pipe. At the same time, it has a relatively large diameter in expanded state to seal the well pipe.

[0006] In some subsea hydrocarbon well pipes, there is a need for plugging devices which may withstand high pressures and high temperatures for a long time. This puts a lot of stress to the packer element being compressed during the sealing period. Moreover, it is a requirement that the plugging device is retrievable from the well after use. Often there is a risk that the packer element becomes deformed during the expansion, which may cause problems with retrieving the plugging device past narrow restrictions in the well pipe.

[0007] The object of the invention is to provide a plugging device which is capable of withstanding a high pressure and a high temperature for a long time and still being able to be retracted after use.

SUMMARY OF THE INVENTION

[0008] The present invention relates to a plugging device comprising a packer device for pressure tight sealing of a pipe, the packer device comprising: • a cone device comprising a first cone and a second cone, each having their base faced towards each other and each comprising a tapering surface; • a first packer supporting device provided on a first side of the cone device; • a second packer supporting device provided on a second side of the cone device; • a packer body provided between the first packer supporting device and the second packer supporting device; where the first and second packer supporting devices comprise supporting arms having a first end movably connected to the plugging device and a second end; where a sliding surface is provided on the first and second packer supporting device for sliding up and down the tapering surface of the first or second cone, thereby bringing the packer device between its expanded and retracted positions respectively; characterized in that the second end is connected to either a front supporting element or a rear supporting element; and where the front supporting elements and the rear supporting elements comprise front surfaces, where the front surfaces are faced towards the base of the first and second cones in the retracted position and provide an extrusion barrier surface for the packer body in the expanded position.

[0009] In one aspect, every second supporting arm is connected to the respective front supporting element and every second supporting arm is connected to the respective rear supporting element.

[0010] In one aspect, the second end of the supporting arms are pivotably connected to the respective front supporting element or the respective rear supporting element.

[0011] In one aspect, the sliding surface comprises a sliding surface provided on each front supporting element and a sliding surface provided on each rear supporting element.

[0012] In one aspect, the first and second packer supporting device are configured so that each front surface of the front supporting elements of the first packer supporting device is faced towards the front surface of the rear supporting elements of the second packer supporting device in the expanded position.

[0013] In one aspect, a guiding system is provided for preventing relative rota- tion between the first and second packer supporting devices during their movement between the retracted position and the expanded position.

[0014] In one aspect, the packer body comprises packer elements provided on the front surface of each front supporting element.

[0015] In one aspect, the front surface of the rear supporting element is supporting rear surfaces of two adjacent front supporting elements both in the retracted and expanded position.

[0016] In one aspect, the front surface of the rear supporting element is provided at lest partially behind the rear surfaces of two adjacent front supporting elements in the retracted position.

[0017] In one aspect, the front surface of the front supporting elements is at least partially curved.

[0018] In one aspect, a cone packer element is provided between the base of the first cone and the base of the second cone.

[0019] In one aspect, the first cone and the second cone is displaceable in an axial direction with respect to each other.

[0020] In one aspect, a connection device is provided for radial orientation of the first cone in relation to the second cone.

[0021] In one aspect, the connection device limits the axial displacement of the first cone in relation to the second cone.

[0022] In one aspect, a retracting device is provided for bringing the first and/or second packer supporting devices from the expanded position to the retracted position.

DETAILED DESCRIPTION

[0023] In the following, embodiments of the present invention will be described in detail with reference to the enclosed drawings, where:

Fig. 1 and 2 illustrates a perspective view of one embodiment of the plugging device in retracted and expanded position respectively;

Fig. 3 and 4 illustrates a side view of the packer device of fig. 1 in retracted and expanded position respectively;

Fig. 5 and 6 illustrates a perspective view of parts of the packer device of fig. 3 and 4 respectively;

Fig. 7 illustrates a side view of the packer device in expanded position;

Fig. 8 illustrates a front supporting element with a packer body and a supporting arm;

Fig. 9 illustrates a front supporting element of fig. 8 without the packer body;

Fig. 10 illustrates rear supporting element and its supporting arm;

Fig. 11 illustrates the rear supporting element of fig. 10;

Fig. 12a illustrates the configuration of the rear supporting elements of the first packer supporting device in the retracted position;

Fig. 12b is similar to fig. 12a, where one front supporting element is provided; Fig. 12c is similar to fig. 12a and 12b, where all front supporting elements are provided;

Fig. 13a illustrates the configuration of the rear supporting elements of the first packer supporting device in the expanded position;

Fig. 13b is similar to fig. 13a, where one front supporting element is provided; Fig. 13c is similar to fig. 13a and 13b, where all front supporting elements are provided;

Fig. 14 illustrates a side view of some of the front and rear supporting elements of the first and second packer supporting devices in the expanded position;

Fig. 15 illustrates a perspective view of all the front and rear supporting elements of the first and second packer supporting devices in the expanded position;

Fig. 16 illustrates an alternative embodiment of a packer body;

Fig. 17 illustrates an alternative embodiment of a front supporting element, a supporting arm and a packer body.

[0024] It is now referred to fig. 1 and 2, illustrating an embodiment of the plugging device 1. The plugging device 1 comprises an anchoring device 2, a connection interface 3 and a packer device 4.

[0025] The anchoring device 2 comprises gripping devices for fixation of the plugging device 1 to an inner wall of a pipe (not shown). It should be noted that fluid is allowed to pass the plugging device when the anchoring device 2 is set, i.e. in its expanded state shown in fig. 2. The anchoring device 2 is considered known for a person skilled in the art, for example from the abovementioned publication US 7,178,602 and will therefore not be described here in detail.

[0026] The connection interface 3 is provided for connection to a setting tool for bringing the plugging device from its retracted or "run" position to its expanded or "set" position and for connection to a retrieval tool for retrieving the plugging device again after use. The connection interface 3, the setting tool and the retrieval tool are also considered known for a skilled person, and will not be explained in detail here either.

[0027] The packer device 4 is provided for pressure tight sealing of the pipe. That is, no fluid is supposed to pass the packer device 4 in the annular space between the outer surface of the plugging device and the inner surface of the wall pipe. It should be noted that the initial design requirement for the plugging device 1 is that it has to pass a restriction with machined inner diameter of 10,48 cm (4.125") (i.e. in retracted position) and is to be set in a 17.78 cm (7") 52 kg/m (35 ppf) casing. Moreover, the packer device 4 according to the present invention is to withstand a pressure difference of 34473 kPA (5000 psi) at a temperature of 170° in the set position. Of course, this initial design requirement does not prevent using the principles of the invention for designing a plugging device for other types of pipes with other diameters, temperatures and pressures.

[0028] It is now referred to fig. 3 - 6. The packer device 4 comprises a cone device 10, a first packer supporting device 20 provided on a first side of the cone device 10 and a second a second packer supporting device 22 provided on a second side of the cone device 10, opposite of the first side in the longitudinal direction of the plugging device 1 as shown in fig. 3.

[0029] The cone device 10 comprises a first cone 12 and a second cone 14, each having their base 12b, 14b faced towards each other and each comprising a tapering surface 12a, 14a. In fig. 3 it can be seen that the base 12b is parallel to the base 14b and that the bases 12b, 14b both are perpendicular to the longitudinal direction of the plugging device. In fig. 5 it is shown that the base 12b of the first cone 12 is circular. In the present invention, the tapering surfaces 12a, 14a are straight.

[0030] In an alternative embodiment, it would be possible to provide the cones 12, 14 with an increasingly tapering surface, or a decreasingly tapering surface i.e. the tapering surface will be curved.

[0031] In the present embodiment, the first cone 12 and the second cone 14 is displaceable in an axial direction with respect to each other. A cone packer element 15 is provided between the base of the first cone 12 and the base of the second cone 14. A connection device 16 is provided for radial orientation of the first cone 12 in relation to the second cone 14. The connection device 16 limits the axial displacement of the first cone 12 in relation to the second cone 14.

[0032] In the present embodiment, the connection device 16 limits the maximum distance between the base of the first cone 12 and the base of the second cone 14. The compression of the cone packer element limits the minimum distance between the base of the first cone 12 and the base of the second cone 14. However, the connection device 16 may also be used to limit the minimum distance between the base of the first cone 12 and the base of the second cone 14. In the present embodiment the connection device 16 comprises at least one screw (see fig. 7), or by means of other types of connection means 16 well known for a person skilled in the art.

[0033] The first and second packer supporting devices 20, 22 of the present embodiment are equal to each other. Each of the first and second packer supporting devices comprises supporting arms 24 having a first end 24a movably or pivotably connected to the plugging device 1 and a second end 24b movably or pivotably connected to either a front supporting element 30 or a rear supporting element 40. It should be noted that it would be possible to connect the second end 24b of the arm 24 to the front supporting element 30 or the rear supporting element 40 in a fixed way, i.e. they are not movable or pivotable in relation to each other.

[0034] In fig. 8 it is shown a supporting arm 24 having its second end 24b pivotably connected to a front supporting element 30. In fig. 10 it is shown a supporting arm 24 having its second end 24b pivotably connected to a rear supporting element 40.

[0035] The supporting arm 24 can for example be similar to those described in US 7,178,602. The supporting arms are therefore considered known for a skilled person, and will not be described in detail herein. The supporting arms form a continuous outer surface around the plugging device in the retracted position and during expansion to the expanded position, thereby preventing debris etc in the well flow to block the expansion/retraction process. This can for example be seen in fig. 5 and 6.

[0036] The pivotation of the supporting arm 24 with respect to the plugging device 1 and the front or rear supporting element 30 or 40 may be provided by a pivotation bolt or any other suitable pivotation mechanism or movable mechanism allowing the supporting arm 24 to move radially out from the plugging device 1.

[0037] A sliding surface is provided on the first and second packer supporting device 20, 22. The sliding surface may comprise several sliding surfaces which may be provided on the front supporting element 30 and/or rear supporting element 40. Alternatively, sliding surfaces could be provided on other parts of the first and second packer supporting devices 20, 22, for example as a part of the supporting arms 24.

[0038] The sliding surface on the first and second packer supporting device 20, 22 is provided for sliding up and down the tapering surface 12a, 14a of the first or second cone, i.e. the sliding surface and the tapering surfaces provides that an axial movement of the first and second packer supporting devices 20, 22 causes a radial movement of the front supporting elements 30 and the rear supporting elements 40.

[0039] The front supporting element 30 will now be described with reference to fig. 9. The front supporting element 30 comprises a sliding surface 31 for sliding up and down the tapering surface 12a, 14a of the first or second cone, depending on whether the front supporting element 30 is a part of the first or second packer supporting device 20 or 22 respectively.

[0040] The front supporting element 30 further comprises a front surface 32 for supporting a packer body generally denoted with reference number 50. The front surface 32 is faced towards the base of the first and second cones 12, 14, for example as shown in the retracted position in fig. 5. In the present embodiment, the front surface 32 is substantially parallel to the base of the first and second cones 12, 14, both in the retracted position and in the expanded position. Hence, the front surface 32 is also faced towards the plane formed by the base of the first and second cones 12, 14 in the expanded position, as shown in fig. 6. More specifically, the front surface 32 of the first packer supporting device 20 is faced towards the plane formed by the base of the second cone 14 and the front surfaces 32 of the second packer supporting device 22 is faced towards the plane formed by the base of the first cone 12, both in the retracted and in the expanded position. In the present embodiment, since the tapered surface 12a, 14a of the cones are straight, the front surface 32 is always per pendicular to the longitudinal direction of the plugging device, i.e. both during retraction and expansion. The front surface 32 is at least partially curved.

[0041] The front supporting element 30 also comprises a radial outer surface 33. The radial outer surface 33 is curved, the curve preferably having a radius R (see fig. 13c) corresponding to the radius of the casing the plugging device is set in.

[0042] The front supporting element 30 also comprises a rear surface 34 provided on the rear side of the front surface 32. The rear surface 34 is substantially planar. On the rear surface 34 a supporting body 35 is provided. When viewed from above in fig. 9, the supporting body 35 is substantially T-shaped, having a stem 35a and a cross bar 35b. A connection interface 36 for pivotably connection to the supporting arm 24 is provided as a part of the cross bar 35b, see for example fig. 14.

[0043] The rear supporting element 40 will now be described with reference to fig. 11. The rear supporting element 40 also comprises a sliding surface 41 for sliding up and down the tapering surface 12a, 14a of the first or second cone, depending on whether the rear supporting element 40 is a part of the first or second packer supporting device 20 or 22 respectively.

[0044] Moreover, the rear supporting element 40 further comprises a substantially planar front surface 42. The front surface 42 is provided for supporting the rear surface 34 of the front supporting element 30 both in the retracted and expanded position.

[0045] The rear surface 42 is also faced towards the base of the first and second cones 12, 14, for example as shown in the retracted position in fig. 5. In the present embodiment, the rear surface 42 is substantially parallel to the base of the first and second cones 12, 14, both in the retracted position and in the expanded position. Hence, the rear surface 42 is also faced towards the plane formed by the base of the first and second cones 12, 14 in the expanded posi tion, as shown in fig. 6. More specifically, the rear surface 42 of the first packer supporting device 20 is faced towards the plane formed by the base of the second cone 14 and the front surfaces 32 of the second packer supporting device 22 is faced towards the plane formed by the base of the first cone 12, both in the retracted and in the expanded position. In the present embodiment, since the tapered surface 12a, 14a of the cones are straight, the rear surface 42 is always perpendicular to the longitudinal direction of the plugging device, i.e. both during retraction and expansion.

[0046] The rear supporting element 40 also comprises a radial outer surface 43. The radial outer surface 43 is curved, the curve preferably having a radius R (see fig. 13c) corresponding to the radius of the casing the plugging device is set in. Hence, in the expanded position showed in fig. 13c, the front and rear supporting elements 30, 40 forms a "torus"-like body having a circular radial outer surface.

[0047] The rear supporting element 40 also comprises a rear surface 44 provided on the rear side of the front surface 42. On the rear surface 44 a supporting body 45 is provided. A connection interface 46 for pivotably connection to the supporting arm 24 is provided on the rear surface 44, see for example fig. 14.

[0048] It is now referred to fig. 12a-c and fig. 13a-c. In fig. 12a it is shown that nine rear supporting elements 40 are providing a "torus"-like ring when arranged next to each other. Moreover, the sliding surfaces 41 of the rear supporting elements 40 may provide a continuous contact surface towards the cone 12 or 14. In the arrangement shown in fig. 12a it is shown that a slit 49 is formed between two adjacent rear supporting elements 40. The shape of the slit 49 between two such rear supporting elements 40 is configured to receive the stem 35a of the front supporting element 30, as shown in fig. 12b.

[0049] In fig. 12c, all nine slits 49 have received one front supporting element 30. Here it is shown that the front surface 42 of one rear supporting element 40 is provided at lest partially behind the rear surfaces 34 of two adjacent front supporting elements 30 in the retracted position. The front surfaces 42 of the rear supporting elements 40 are supporting the rear surfaces 34 of the front supporting elements 30 in the retracted position.

[0050] In fig. 12c it is shown that the sliding surfaces 31 of the front supporting elements 30 may form a substantially continuous contact surface towards the cone 12 or 14.

[0051] In the expanded position shown in fig. 13a, the distance between the rear supporting elements 40 increases as they slide on the tapering surface of the cone 12 or 14. As shown in fig. 13b and 13c, there is still contact between the front surfaces 42 of the rear supporting elements 40 and the rear surfaces 34 of the front supporting elements 30 in the expanded position. It should be noted that that the sliding surfaces 31 and 41 of the front and rear supporting elements 30, 40 together may provide a substantially continuous surface towards the cone 12 or 14 in the expanded position, as illustrated in fig. 13c by the dashed line A.

[0052] Moreover, the radial outer surfaces 33, 43 of the front and rear supporting elements 30 and 40 together forms a substantially continuous radial outer surface as illustrated in fig. 13c by the dashed line B.

[0053] From fig. 5 and 6 it is clear that every second supporting arm 24 of the first supporting device 20 is pivotably connected to the respective front supporting elements 30 and every second supporting arm 24 is pivotably connected to the respective rear supporting elements 40. This is also the case for the second supporting device 22.

[0054] It is now referred to fig. 14 and 15. Here it is shown that the first and second packer supporting device 20, 22 are configured so that each front surface 32 of the front supporting elements 30 of the first packer supporting device 20 is faced towards a front surface 42 of the rear supporting elements 40 of the second packer supporting device 22 in the expanded position. Consequently, each front surface 32 of the front supporting elements 30 of the second packer supporting device 22 is faced towards a front surface 42 of the rear supporting elements 40 of the first packer supporting device 20 in the expanded position.

[0055] In fig. 14 it is shown that the straight dashed line D is going through both the centre of the front surface 32 of the front supporting element 30 and the centre of the front surface 42 of the rear supporting element 40.

[0056] In the first embodiment shown in figs. 3 - 8, the packer body 50 comprises packer elements 50a provided on the front surface 32 of each front supporting element 30. The packer element 50a is made of a ductile material, such as an elastomeric material and/or a rubber material etc, which may withstand the pressure and temperature required for the well pipe being sealed. The packer element 50a may be molded onto the front supporting element 30. In the present embodiment, the radial inner part 51 of each packer element 50a is protruding in an axial direction in relation to the radial outer part 52 (see fig. 8). In this way the radial inner part 51 will be pressed downwards toward the cone device in the expanded position.

[0057] The plugging device may be provided with a guiding system for preventing relative rotation between the first and second packer supporting devices 20, 22 during expansion and retraction. In fig. 7 it is shown a guiding pin 28 provided in a guiding groove (not shown) preventing a relative rotation between the first and second packer supporting devices 20, 22.

[0058] The operation of the packer device 4 will now be described. The packer device 4 is initially in its retracted position. A retracting device 60 (see fig. 7), for example a spring etc may be provided for bringing the first and second packer supporting devices 20, 22 back to their retracted position. The retracting device 60 is in one end fixed to the supporting arm 24 and in the other end to the respective first or second part of the plugging device, as shown in fig. 7. It should be noted that the packer element 50a is not stressed in the retracted position.

[0059] For bringing the packer device 4 to its expanded position, a first part 1a of the plugging device 1 is pressed towards a second part 1b of the plugging device (see fig. 7), as is known for a skilled person. The guiding system prevents a relative rotation between the first part 1a and the second part 1b. Consequently, the sliding surfaces 31,41 of the front and rear supporting elements 30, 40 starts to slide on the tapering surfaces 12a, 14a of the cones 12, 14 as they pivot with respect to the supporting arms 24.

[0060] In the expanded position, the packer element 50a is pressed between the front surface 32 of the front supporting elements 30 and the front surface 42 of the rear supporting elements 40. Hence, the front surface 42 of the rear supporting element 40 is configured to support a packer element 50a of the opposite packer supporting device 20, 22 when in the expanded position.

[0061] As shown in fig. 4, the packer elements 50a form a continuous packer around the packer device 4, where every second packer element 50a is fixed to the first packer supporting device 20 and every second packer element 50a is fixed to the second packer supporting device 22.

[0062] In fig. 15 it is shown that the front surfaces 32, 42 together have a form similar to a circular ring. This circular surface forms an extrusion barrier surface for the packer body 50. The packer body 50 will form a seal towards the pipe in the expanded position, and the extrusion barrier surface prevents the extrusion of the packer body 50. Moreover, the expansion will also provide that the first cone 12 is displaced towards the second cone 14, thereby providing a compression of, and a radial expansion of, the cone packer element 15. Hence, the cone packer element 15 will be pressed towards the packer body 50 along its radial periphery. Hence, a continuous ductile seal is provided in the pipe by the cone packer element 15 and the packer body 50.

[0063] In fig. 14 the central line between the front and rear supporting elements of the respective first and second supporting devices 20, 22 is illustrated by the dashed line C. The curved shape of the front surface 32 of the front supporting elements 30 provides that the opening for the packer body 50 between the first supporting device 20 and the second supporting device 22 is approximately the same around the periphery. Hence, the stress on the packer body 50 is substantially similar around the periphery.

[0064] When the packer device 4 is to be retracted, the first part 1a of the plugging device 1 is pulled away from the second part 1 b of the plugging device 1, as is familiar for a skilled person. The sliding surfaces 31, 41 will now slide down on the tapering surfaces of the cones 12, 14 due to the force applied by the retracting device 60, thereby pressing the supporting arms 24 radially inwards. The first part 1a is pulled away from the second part 1b until the maximum distance between the base of the first cone 12 and the base of the second cone 14 is reached due to the connection device 16. Then the plugging device 1 has reached the retracted position and may be retrieved from the well pipe.

[0065] In the first embodiment described above, the packer body 50 comprised several packer elements 50a. However, in a second embodiment, the packer body 50 may be provided as one packer element 50b. In fig. 16 one embodiment of such a packer element 50b is illustrated. The packer element 50b comprises one continuous packer which is folded to allow it to expand and retract. The packer element 50b comprises nine folds 53 which may be fixed to the respective nine front supporting elements 30 of one of the packer supporting devices 20, 22. In yet an alternative embodiment the packer body 50 could comprise two or more such packer elements 50b, each fixed to each other and/or the front supporting elements 30 of the first and second packer supporting device 20, 22 respectively.

[0066] Another embodiment is illustrated in fig. 17. Here, the packer body 50 comprises several packer elements 50c. The packer elements 50c is, as the packer elements 50a described above, made of a ductile material. However, in this embodiment each packer element 50c is connected to the front surface 32 of the front supporting element 30 by means of a sliding dove-tail joint 54. The packer element 50c also provided with pieces 55 of a plastic deformable material, a more rigid material than the ductile material. As shown in fig. 17, the part of the packer element 50c which forms the dovetail joint is made of the plastic deformable material. The dovetail joint 54 allows the packer element 50c to slide radially out towards the inner surface of the pipe in the expanded position, to improve the seal in cases where the pipe has been deformed. The dove-tail joint 54 comprises stopping means to limit the radial movement of the packer element 50c in relation to the front supporting element 30.

[0067] Even though the description above have been focused on a plugging device for hydrocarbon well pipes, it should be noted that the plugging devices could also be used for plugging other types of pipes, for example water pipes etc.

Claims

A plug assembly (1) comprising a closure means (4) for pressure-tight sealing of a tube, the closure means (4) comprising: - a cone assembly (10) comprising a first cone (12) and a second cone (14) having their base portions facing each other and each having a tapered surface (12a, 14a); - a first closure support device (20) provided on a first side of the cone device (10); - a second closure support device (22) provided on another side of the cone device (10); - a closure body (50) provided between the first closure support device (20) and the second closure support device (22); - and wherein the first and second closure support devices (20, 22) comprise support arms (24) with a first end (24a) movably connected to the plug device (1) and a second end (24b); and wherein on the first and second closure support means (20, 22) there is a sliding surface which can slide up and down by a tapered surface (12a, 14a) on the first or second cone (12, 14) so that the closure device ( 4) can be moved between an extended end position and a retracted position; characterized in that the other end (24b) is connected to either a front support member (30) or a rear support member (40); and wherein the front support members (30) and the rear lower support members (40) comprise some front faces (32, 42), wherein these front faces (32, 42) - in a retracted position - face the base portion of the first and second cones (12, 14), but - in an extended position - provides an extended barrier surface on the shutter body (50).

A plug assembly according to claim 1, wherein each other support arm (24) is connected to the respective front support member (30) and each other support arm (24) is connected to the respective rear support member (40).

A plug assembly according to claim 1 or 2, wherein the other end (24b) of the support arms (24) is pivotally connected to the respective front support member (30) or the respective rear support member (40).

A plug assembly according to claim 1, wherein the sliding surface comprises a sliding surface (31) provided on each front support member (30) and a sliding surface (41) provided on each rear support member (40).

A plug assembly according to claim 1, wherein the first and second closure support devices (20, 22) are designed such that each front face (32) of the front support member (30) of the front closure support support (20) faces a front face (42). ) on the rear support member (40) of the second closure support device (22) - in the extended position.

A plug device according to claim 5, wherein a guiding system is provided for preventing a relative rotation between the first and second closing device support devices (20, 22) during the movement of these devices between a retracted position and an extended position.

A plug assembly according to claim 1, wherein a closure body (50) comprises closure members (50a; 50c) provided on the front face (30) of each front support member (30).

A plug assembly according to claim 2, wherein the front face (42) of the rear support member (40) supports some rear face (34) of two adjacent front support members (30) - both in the retracted position and in the extended position. position.

A plug assembly according to claim 8, wherein the front face (42) of the rear support member (40) is at least partially behind the rear face (34) of two adjacent support members (30) - in the retracted position. .

A plug device according to claim 1, wherein the front face (32) of the front support means (30) is at least partially curved.

A plug assembly according to claim 1, wherein there is a tapered closure member (15) between the base portion of the first cone (12) and the base portion of the second cone (14).

A plug device according to claim 11, wherein the first cone (12) and the second cone (14) can be displaced in axial direction relative to each other.

A plug assembly according to claim 11 or 12, wherein a connecting device (16) is provided for radially orienting the first cone (12) relative to the second cone (14).

A plug device according to claim 13, wherein the connecting device (16) is arranged to limit the axial displacement of the first cone (12) relative to the second cone (14).

A plug device according to claim 1, wherein a retracting device (60) is provided which is capable of bringing the first and / or the second closure support device (20, 22) from the extended position to the retracted position.